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  <title>Get the Internet host name corresponding to a given IP address</title>

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</div><hr /><div id="function.gethostbyaddr" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">gethostbyaddr</h1>
  <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">gethostbyaddr</span> &mdash; <span class="dc-title">
   Get the Internet host name corresponding to a given IP address
  </span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.gethostbyaddr-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="type">string</span> <span class="methodname"><strong>gethostbyaddr</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$ip_address</code></span>
   )</div>

  <p class="para rdfs-comment">
   Returns the host name of the Internet host specified by
   <em><code class="parameter">ip_address</code></em>.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.gethostbyaddr-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<em><code class="parameter">ip_address</code></em></dt>

     <dd>

      <p class="para">
       The host IP address.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.gethostbyaddr-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   Returns the host name on success, the unmodified <em><code class="parameter">ip_address</code></em>
   on failure, or <strong><code>FALSE</code></strong> on malformed input.
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.gethostbyaddr-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-4382">
    <p><strong>Example #1 A simple <span class="function"><strong>gethostbyaddr()</strong></span> example</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$hostname&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">gethostbyaddr</span><span style="color: #007700">(</span><span style="color: #0000BB">$_SERVER</span><span style="color: #007700">[</span><span style="color: #DD0000">'REMOTE_ADDR'</span><span style="color: #007700">]);<br /><br />echo&nbsp;</span><span style="color: #0000BB">$hostname</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.gethostbyaddr-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="function.gethostbyname.html" class="function" rel="rdfs-seeAlso">gethostbyname()</a> - Get the IPv4 address corresponding to a given Internet host name</span></li>
    <li class="member"><span class="function"><a href="function.gethostbynamel.html" class="function" rel="rdfs-seeAlso">gethostbynamel()</a> - Get a list of IPv4 addresses corresponding to a given Internet host
   name</span></li>
   </ul>
  </p>
 </div>


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